[PDF] Ray Tracing Simulation Of Swept Frequency Backscatter Ionograms eBook

Author : Ming S. Wong
Publisher :
Page : 32 pages
File Size : 10,41 MB
Release : 1974
Category : Backscattering
ISBN :

GET BOOK

Computed swept-frequency traces of minimum group-path in backscatter-radar ionograms are presented for ionospheric electron distributions in the polar region. Some of the traces for ground backscatter contain cusps that are shown to result when a small fraction of rays from the radar encounter a region in which the vertical electron-density gradient decreases sharply with distance after the rays passed through apogees. An accurate geomagnetic field model is used in obtaining traces for direct backscatter from field-aligned ionization that causes radar auroral clutter. A method is described for representing three-dimensional electron distributions. The method is sufficiently flexible for iterative ray computations, which appear as a reasonable and potentially reliable approach to the problem of converting backscatter-radar ionograms to electron distributions.

Author : Ming S. Wong
Publisher :
Page : 28 pages
File Size : 30,5 MB
Release : 1975
Category : Backscattering
ISBN :

GET BOOK

Swept-frequency traces of minimum group-path length in backscatter-radar ionograms, computed for a measured three-dimensional electron distribution in the midnight sector of the polar ionosphere, are presented. Also presented are minimum group-path traces computed for trial electron distributions chosen to simulate the group-path traces of the measured electron distribution, and to show the effects on the group-path traces as consequences of variations made upon major features of the trial electron distributions.

Author : Ming S. Wong
Publisher :
Page : 0 pages
File Size : 20,44 MB
Release : 1974
Category : Backscattering
ISBN :

GET BOOK

Computed swept-frequency traces of minimum group-path in backscatter-radar ionograms are presented for ionospheric electron distributions in the polar region. Some of the traces for ground backscatter contain cusps that are shown to result when a small fraction of rays from the radar encounter a region in which the vertical electron-density gradient decreases sharply with distance after the rays passed through apogees. An accurate geomagnetic field model is used in obtaining traces for direct backscatter from field-aligned ionization that causes radar auroral clutter. A method is described for representing three-dimensional electron distributions. The method is sufficiently flexible for iterative ray computations, which appear as a reasonable and potentially reliable approach to the problem of converting backscatter-radar ionograms to electron distributions.

Author : Ming S. Wong
Publisher :
Page : 0 pages
File Size : 35,51 MB
Release : 1975
Category : Backscattering
ISBN :

GET BOOK

Swept-frequency traces of minimum group-path length in backscatter-radar ionograms, computed for a measured three-dimensional electron distribution in the midnight sector of the polar ionosphere, are presented. Also presented are minimum group-path traces computed for trial electron distributions chosen to simulate the group-path traces of the measured electron distribution, and to show the effects on the group-path traces as consequences of variations made upon major features of the trial electron distributions.

Author : Ming S. Wong
Publisher :
Page : 23 pages
File Size : 27,42 MB
Release : 1976
Category : Backscattering
ISBN :

GET BOOK

Jones' ray-tracing program and integrated subroutines by Langworthy and Barrett are being used to compute swept-frequency ionograms, for backscatter by ground and field-aligned ionization, in the presence of sharp horizontal boundaries in electron-density distributions. Prominent characteristics, minimum group-path traces, ray-density variations, and off-great-circle deviation along ray paths are presented for various alterations on major features of initial electron distributions. (Author).

Author :
Publisher :
Page : 794 pages
File Size : 20,32 MB
Release : 1980
Category : Aeronautics
ISBN :

GET BOOK

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.